The mirror and ion cyclotron anisotropy instabilities
Abstract
The linear dispersion equation for fully electromagnetic waves and instabilities at arbitrary directions of propagation relative to a background magnetic field B_{o} in a homogeneous Vlasov plasma is solved numerically for biMaxwellian particle distributions. For isotropic plasmas the dispersion and damping of the three modes below the proton cyclotron frequency are studied as functions of β_{i} and T_{e}/T_{i}. The transport ratios of helicity, crosshelicity, Alfvén ratio, compressibility, and parallel compressibility are defined. Under the condition that the proton temperature perpendicular to B_{o} is greater than the parallel temperature, the growth rates and transport ratios of the mirror instability and the ion cyclotron anisotropy instability are examined and compared. Both the proton parallel compressibility and the proton Alfvén ratio are significantly different for the two growing modes.
 Publication:

Journal of Geophysical Research
 Pub Date:
 June 1992
 DOI:
 10.1029/92JA00299
 Bibcode:
 1992JGR....97.8519G
 Keywords:

 Anisotropic Media;
 Ion Cyclotron Radiation;
 Magnetohydrodynamic Stability;
 PlasmaElectromagnetic Interaction;
 Space Plasmas;
 Magnetic Mirrors;
 Magnetosheath;
 Plasma Physics;
 Vlasov Equations;
 Plasma Physics;
 Space Plasma Physics: Waves and instabilities;
 Magnetospheric Physics: Magnetosheath;
 Magnetospheric Physics: Plasma waves and instabilities